1851 / 1906
HVAC
37
Is piping free of damage
and cracks?
Are piping connections
free of oil grime?
(Visual Inspection)
Are piping connections
free of gas leakage?
Are piping installation
points on condense free
of gas leakage?
Are piping installation
points on receiver/drier
free of gas leakage?
Are piping installation
pints on A/C Compressor
free of gas leakage?
Are piping installation
points on cooling unit free
of gas leakage.
Perform gas leak inspec-
tion using gas leak tester.
Are above items okay?
No
If piping or A/C component
(s)
is damaged or
cracked, replace then go to Step
19.Ifthere is gas
leakage, repair or replace connection and replace
condenser, then go Step 19.
9
Inspect evaporator piping
connections in cooling unit
for gas leakage
Are piping connections for
evaporator in cooling unit
free of gas leakage?
Yes
Adjust refrigerant amount to specified level, then go
to Step 19.
No
If piping damaged or cracked, replace then go to
Step 19.
If there is gas leakage, repair or replace connection
and replace condenser then go to Step 19.
10
Verify whether malfunction
is in compressor oil or else-
where
Add 30 ml of compressor oil.
Is noise heard when racing
engine?
Yes
Go to next step.
No
Troubleshooting completed.
Explain repair to customer.
11
Verify whether malfunction
is in a/c compressor or
elsewhere
Drain compressor oil. Is it
contaminated with metal
particles?
Yes
Go to next Step.
No
Replace A/C compressor, then go to Step 19.
12
Verify whether malfunction
is somewhere in a/c system
or elsewhere
Is compressor oil whitish
and mixed with water?
Yes
Replace entire A/C system
(Excluding heater),
then
go to Step 19.
No
Go to next step.
13
Inspect a/c compressor oil
Is compressor oil darker
than normal and contami-
nated with aluminum chips?
Yes
Replace A/C compressor and condenser, then go to
Step 19
(Since A/C compressor may be worn and
receiver/drier may be clogged, replacement of re-
ceiver/drier is necessary.)
No
Condition is normal. Recheck malfunction symp-
toms.
14
Verify whether malfunction
is in a/c compressor or
Yes
Replace A/C compressor, then go to Step 19.
(A/C
compressor discharge valve left open)